Tactility modules refactored (#13)

* refactor modules

* moved esp_lvgl_port to libs/

* added missing file

* fix for sim build

* various sim/pc fixes

* lvgl improvements

* added missing cmake files

libs/lvgl/demos/widgets/lv_demo_widgets.h

@@ -0,0 +1,40 @@
+/**
+ * @file lv_demo_widgets.h
+ *
+ */
+
+#ifndef LV_DEMO_WIDGETS_H
+#define LV_DEMO_WIDGETS_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+#include "../lv_demos.h"
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+void lv_demo_widgets(void);
+void lv_demo_widgets_close(void);
+
+/**********************
+ *      MACROS
+ **********************/
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /*LV_DEMO_WIDGETS_H*/